Abstract
Based on the radionuclide distributions in sedimentary coal-bearing strata, this study analyzed the microrelease mechanisms of radon in coal-bearing strata. It was found that the microrelease process includes three stages: emanation, migration, and exhalation. Based on this, an experimental apparatus was independently designed for monitoring radon during compression of coal/rock samples from coal-bearing strata, whose major components include an electrohydraulic servocontrolled rock mechanics testing system, an airtight container, coal/rock samples, radon output device, and a continuous emanometer. The developed apparatus was preliminarily utilized for uniaxial compression tests on mudstone samples taken from the #21105 coalface of the Fourth Coal Mine in Yili Coalfield, China. The test results show that before sample failure under the uniaxial compressive load (UCL), the radon concentration is negatively correlated with the applied UCL and the magnitude of imposed elastic deformation. Increasing the applied load shortens the period of stable deformation, gradually decreasing the porosity of the rock, and as a result of declining the concentration of radon emanation from the rock. Finally, suggestions for future research are proposed, including mathematical equations to express the correlations between different experimental parameters and fractal characteristics of radon release from porous media.
Highlights
Radon (Rn) was first discovered from minerals containing radium in 1990
Specific Implementation Method. e utilized MTS815 test system has a base plate at its bottom and an indenter at its top, with the airtight container placed in between. e following steps were undertaken for conducting the tests: (a) Each coal/rock sample was appropriately put into the airtight container as required; (b) e valve was opened to let the radon output device input radon into the airtight container; (c) e MTS815 test system applied a uniaxial compressive load to the coal/rock sample and the KJD2000R continuous emanometer measured the radon concentrations during compression of the sample
The microrelease mechanisms of radon in coalbearing strata were analyzed, an experimental apparatus was independently designed for monitoring radon during compression of coal/rock samples from coal-bearing strata, and the apparatus was preliminarily utilized for uniaxial compression tests on mudstone samples taken from #21105 coalface of the Fourth Coal Mine in Yili Coalfield, China
Summary
Radon (Rn) was first discovered from minerals containing radium in 1990. Since this radioactive element and its decay products have received growing attention. To ensure the reliability and accuracy of the current radon detection method in solving engineering problems related to coal mines, some fundamental issues need to be further studied, such as the relationship between radon concentration and coal/rock deformation. For this reason, this study analyzed the microrelease mechanisms of radon in coal-bearing strata. This study analyzed the microrelease mechanisms of radon in coal-bearing strata On this basis, an experimental apparatus for monitoring radon during compression of coal/rock samples was independently developed. Suggestions for future research are provided in this paper related to mathematical equations to show the correlations between the experimental parameters and fractal characteristics of radon release from porous media
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